Temporary architecture, buildings created to be torn down after a special event or brief use, gave us fascinating and revolutionary works in the 19th and 20th century. But some outlasted their death sentences to become permanent. Here are some of the most amazing examples.

The Crystal Palace, Hyde Park, London, designed by Sir Joseph Paxton, built for the Great Exhibition of 1851. It had the largest amount of glass ever seen in a building.

A year after the Great Exhibition, it was relocated to Sydenham Hill, and stood there until 1936, when it was destroyed in a fire.http://io9.com/some-of-the-mo...

Some of the world's most beautiful buildings have risen up, only to be destroyed or demolished …
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Royal Exhibition Building, Melbourne, Australia, designed by William Reed, built to host the Melbourne International Exhibition in 1880-1881. Later it hosted the opening of the first Commonwealth of Australia Parliament in 1901, and now it's an exhibition venue.

The 1,063 ft (324 m) high Eiffel Tower, one of the most copied structures in the world, built as the entrance arch to the 1889 World's Fair. The original idea was for the tower to be dismantled in 1909, twenty years after it was built.

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The Nashville Parthenon in Nashville, Tennessee, a full-scale replica of the famous Parthenon in Athens, Greece, built of plaster, wood and brick, as a part of the Tennessee Centennial Exposition in 1897.

These materials lasted until 1920, when the city of Nashville started to replace it with concrete and other permanent materials, which took eleven years.

Palace of Fine Arts, San Francisco, California, one of the ten palaces constructed for the 1915 Panama-Pacific Exposition, built around an artificial lagoon. It was so beloved that a Palace Preservation League was founded to save the place from demolition.

The mixture of wood, plaster and burlap-type fiber started to crumble in the 1950s, and the vandals loved the place, so the Palace was completely demolished, and a permanent steel and concrete structure was built using the original steel structure.

The 335 ft (102 m) Atomium with nine 59 ft (18 m) diameter stainless steel clad spheres, constructed for the 1958 World Fair, Brussels, Belgium, designed by André Waterkeyn and André and Jean Polak. It survived demolition because of its popularity and it turned to a key landmark instantly.

The London Eye, which was the world's tallest Ferris wheel (443 ft or 135 m) when erected in 1999. It stands near the River Thames in London since then, even though it was originally planned to be dismantled in 2005.